Android/iOS/Windows/Mac: Unified Remote is one of our favourite remote control apps. You can use it to control most functions on your computer from your phone, unless your computer is a Mac and your phone is an iPhone. Until today, that is.
The company just released a brand new iOS app as well as a version of the server that can run on OS X. All of the apps are cross-compatible, so if you own a Mac and want to control it with your Android phone, you're good to go.